초록 ▼

A method for manufacturing decorative features in situ in a base layer cast plastic material includes the steps of providing a mold tool having a surface thereon which is recessed in the form of a desired decorative feature and includes a sharp break line between the recess and the surrounding mold

A method for manufacturing decorative features in situ in a base layer cast plastic material includes the steps of providing a mold tool having a surface thereon which is recessed in the form of a desired decorative feature and includes a sharp break line between the recess and the surrounding mold surface; depositing a covering of thermoplastic material in the recess surface and heating the tool to melt the thermoplastic material on the recess surface to form segments of plastic corresponding to the desired decorative feature; thereafter cooling the covering and stripping it from the mold by separating it at the sharp break line interface between the deposited material on the recessed surface and a thin film membrane formed on the remainder of the mold surface so as to retain segments of material deposited in the recesses of the mold tool; reheating the mold tool recess to partially remelt the retained segments and thereafter depositing a base layer of thermoplastic material across the surface of the mold and reheating the mold to bond the retained segments to the base layer and cooling and stripping the mold to form a finished plastic shell having a decorative feature formed in situ therein.

대표청구항 ▼

In a process for forming a decorative feature in situ in a base layer of a plastic shell made from thermoplastic material cast against a heated tool having a mold surface thereon the improvement comprising: forming a recessed surface on the mold surface corresponding to the desired decorative featur

In a process for forming a decorative feature in situ in a base layer of a plastic shell made from thermoplastic material cast against a heated tool having a mold surface thereon the improvement comprising: forming a recessed surface on the mold surface corresponding to the desired decorative feature; providing a sharp breakline between the recessed surface and the mold surface; heating the mold surface; depositing a first layer of thermoplastic material on the mold surface and the recessed surface therein to provide a covering thereon and melting the covering into the recessed surface while simultaneously forming a thin membrane on the mold surface; cooling the covering including the thin membrane and lifting the thin membrane from the mold surface while separating the thin membrane from the material retained in the recessed surface which corresponds to the desired decorative feature, at the sharp breakline; reheating the tool to partially remelt the material retained in the recessed surface; depositing a base layer of thermoplastic material across the surface of the mold and bonding it to the partially remelted material retained in the recessed surface; cooling and stripping the bonded thermoplastic material from the mold surface so as to form the shell with the decorative feature defined by the material which was retained in the recessed surface and which was then formed in situ in the base layer of thermoplastic material.